Solar photovoltaic (PV) modules convert sunlight directly into DC electrical energy and are constructed by interconnecting multiple solar cells in series or parallel combinations to achieve the required voltage and current. A solar module consists of interconnected cells enclosed within a protective assembly, with charging batteries being one of the primary applications described in the report. Historically, solar modules were commonly designed for 12-volt battery charging, with 36 crystalline silicon cells connected in series to provide a standard module output.
Crystalline silicon remains a major solar PV technology, with monocrystalline and polycrystalline cells offering different performance characteristics. A typical module incorporates six principal components: an extruded aluminium frame, tempered glass, silicon PV cells, EVA encapsulation film, a polymer backsheet, and a junction box containing diodes and connectors. These components protect the cells from environmental and mechanical stresses while supporting reliable electrical performance.
PV module manufacturing involves processes such as cell testing, tabbing and stringing, layup, lamination, inspection, and electrical testing. The report also covers module specifications, PV technologies, applications, plant and machinery, plant layout, location factors, market segments, project implementation, and supplier considerations. The project is presented as a manufacturing operation with a stated plant capacity of 304 Nos/Day and associated capital investment and operating considerations.
| Particulars | Value |
|---|---|
| Plant Capacity | 304 Nos/Day |
| Land & Building (4000 sq.mt.) | Rs. 2.58 Cr |
| Plant & Machinery | Rs. 2.63 Cr |
| Working Capital for 2 Months | Rs. 10.78 Cr |
| Total Capital Investment | Rs. 16.39 Cr |
| Rate of Return | 13% |
| Break Even Point | 76% |
A solar PV module is an assembly of interconnected photovoltaic cells designed to produce useful electrical voltage and current.
Individual solar cells generate relatively small electrical output, so multiple cells are connected in series or parallel combinations. The cells are then encapsulated and protected using materials such as glass, EVA film, a backsheet, an aluminium frame, and a junction box. The resulting module can be integrated into solar power systems for applications including battery charging and electricity generation.
The six main components are the aluminium frame, tempered glass, silicon PV cells, EVA encapsulation film, rear backsheet, and junction box.
Each component performs a specific function. The cells generate electricity, while the glass provides front-side protection. EVA encapsulates and protects the cells, the backsheet provides rear protection and electrical insulation, and the aluminium frame supplies structural support. The junction box provides electrical connections and typically houses bypass diodes that help protect cell strings under partial shading conditions.
EVA film encapsulates the solar cells and helps protect them from moisture, dirt, vibration, and mechanical impact.
EVA, or ethylene vinyl acetate, is a transparent polymer used on either side of the interconnected cells during module lamination. It holds the cells in position and provides a protective layer between the cells and the glass and backsheet. The material must withstand temperature and humidity variations over long periods because the quality of encapsulation can significantly influence module durability and resistance to moisture ingress.
Bypass diodes help protect PV cell strings against undesirable current conditions caused by partial shading or soiling.
The diodes are normally housed inside the module junction box and provide a path that helps bypass affected cell sections. This reduces the impact of shaded or poorly performing cells on the module circuit and helps limit reverse-current effects. Their reliability is therefore an important consideration in module construction, although the report notes that bypass diodes can require replacement in some module designs.
Monocrystalline and polycrystalline modules differ primarily in the structure and manufacturing approach of their silicon cells.
Monocrystalline cells are produced from a single-crystal silicon structure, while polycrystalline cells are formed from multiple silicon crystal structures. These differences influence electrical performance, manufacturing characteristics, appearance, and application suitability. The report identifies both technologies as crystalline silicon PV module types and discusses their construction, advantages, disadvantages, and applications.
Solar PV module manufacturing can require equipment for cell testing, tabbing and stringing, layup, lamination, module testing, and inspection.
The project report specifically identifies a cell tester, tabbing and stringing machine, layup machine, module laminator, module tester, and laser inspection machine. These machines support different stages of the manufacturing process, from checking incoming cells and forming interconnected cell strings through assembly, encapsulation, inspection, and final electrical testing.
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